New PDF release: Atomic Absorption Spectrometry

By John Edward Cantle (Eds.)

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This situation has been brought about by considerable improvements in instrumentation and also, perhaps partly as a result of this, a better understanding among analysts of the types of interference effect that may modify the expected response of a given element. Atomic absorption methods combine the specificity of other atomic spectral methods with the adaptability of wet chemical methods. High specificity means that elements can be determined in the presence of each other. Separations, which are necessary with almost all other forms of wet analysis, are reduced to a minimum and often avoided altogether, making a typical atomic absorption analytical procedure attractively simple.

The flame generates a ground state atomic vapour from the sample. This is irradiated by specific radiation from the hollow-cathode lamp. Some of this radiation is quantitatively absorbed at discrete wavelengths and the monochromator isolates the part of the spectrum over which that absorption is most precisely measured. The baseline, or background transmission of the system against which any absorption will be measured is set up by aspirating distilled water and adjusting the instruments readout to zero absorbance.

The only absolute limitation is that the maximum current specified must not be exceeded. The current actually recommended for a particular lamp is always a compromise since there is no clearly defined optimum and no specific lamp current corresponding to peak performance. The most obvious effect of altering lamp current is the pffect on intensity. Lamp intensity by itself is not important in absorption spectrometry (because the absorption signal does not depend on absolute intensity), but the secondary effect of improving the signal-to-noiseratio seems desirable.

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